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At a certain point in the modeling workflow, you need to define the physics of a model. When working with a model that includes multiple physical phenomena, this requires choosing physics, applying boundary conditions, and combining physics; among other tasks. In the COMSOL Multiphysics® software, there are several modeling approaches you can use to efficiently add multiple physical effects.

Using the COMSOL® software's preconfigured multiphysics interfaces is a strongly recommended way to add the physics to a multiphysics model. Multiphysics interfaces are available in several different application areas and disciplines and enable you to quickly add and set up the physics in a model. Additionally, the built-in multiphysics interfaces include optimal settings for discretization and computation of the physics by default.

Another way to add the physics to a multiphysics model is with the sequential approach. You can add and set up each individual physics interface in a separate study, combine the physics, and solve the full multiphysics problem. This approach enables you to troubleshoot and validate the results of each physics setup separately before solving them in tandem.

A third approach that you can use to assign the physics in a multiphysics model is the manual approach. You administer multiphysics couplings between the physics interfaces in your model by manually specifying how single physics affect each other. This can include making material properties or boundary conditions functions of the dependent variables of another physics interface. This approach is available when there is no preconfigured multiphysics interface or multiphysics coupling available for the physics included in your model component.

In this video, we will show you how to add the physics for a multiphysics model using the three approaches mentioned above. Additionally, we will discuss the advantages and benefits of each approach.